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Titanium surface preparation batio 3 /tio 2 Methods of Piezoelectric Antimicrobial Coatings

An antibacterial coating and piezoelectric technology, applied in the field of metal surface coating, can solve the problems of easy corrosion, endangering the ecological environment, non-wear resistance, etc., and achieve the effects of high production efficiency, simple preparation process and low cost

Active Publication Date: 2022-07-15
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the single micro-arc oxidation electrolyte in this method, it is not conducive to the growth of the film layer. The prepared micro-arc oxidation layer is extremely thin and can be used for dielectric films. If it is used as a marine anti-corrosion and anti-fouling coating, it is extremely wear-resistant Can not meet the service conditions; secondly, the film prepared by this method is easy to generate BaCO 3 phase, which is easily corroded under acidic conditions, thus destroying the integrity of the film and accelerating the corrosion of titanium metal, etc.
[0005] In view of the above research status and problems, the present invention aims to provide a method for preparing antibacterial and antifouling coatings on titanium surfaces based on piezoelectric responses, that is, using micro-arc oxidation technology to use spontaneously polarizable BaTiO 3 Micro-nano particles modify the titanium surface (under the excitation of sea waves, ultrasound or other external forces, the polarization phenomenon of the modified titanium surface will be more obvious), which endows the titanium substrate with excellent antibacterial, corrosion and wear resistance properties, and avoids Solve the problem that the traditional antibacterial micro-arc oxidation titanium coating will endanger the ecological environment and affect the health of organisms through the release of heavy metal ions for sterilization

Method used

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  • Titanium surface preparation batio <sub>3</sub> /tio <sub>2</sub> Methods of Piezoelectric Antimicrobial Coatings
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  • Titanium surface preparation batio <sub>3</sub> /tio <sub>2</sub> Methods of Piezoelectric Antimicrobial Coatings

Examples

Experimental program
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Effect test

Embodiment 1

[0044] This example provides a method for preparing BaTiO on the surface of a titanium substrate 3 / TiO 2 The method of piezoelectric antibacterial coating, the steps are as follows:

[0045] (1) The titanium matrix TA1 (its chemical composition is (wt.%), Fe: 0.03-0.05%, C: 0.08%, N: 0.03%, H: 0.014-0.018%, O: 0.015-0.018%, the rest For Ti (≥99.8wt.% purity)), cut it into a square sample of 50×50×0.5mm, then use 180#, 360#, 800# and 1200# sandpaper to grind and polish step by step, and then the polished titanium substrates were respectively Ultrasonic cleaning was performed for 10 min in acetone, ethanol and pure water to obtain pretreated titanium samples, which were then dried in cold air for later use;

[0046] (2) The pretreated titanium sample obtained in step (1) was immersed through a wire to contain 0.014mol / L Na 2 SiO 3 ·9H 2 O, 0.017mol / L (NaPO 3 ) 6 and 0.026mol / L BaTiO 3 Powder (particle size less than 3μm) in the electrolyte (prepared the above chemical r...

Embodiment 2

[0054] This example provides a method for preparing BaTiO on the surface of a titanium substrate 3 / TiO 2 The method of piezoelectric antibacterial coating, the steps are basically the same as in Example 1, the difference is only: in this experimental example, in step (3), in order to improve the surface roughness of the micro-arc oxidation coating, the micro-arc oxidation voltage output For positive and negative pulses, the positive pulse voltage is 500V, the negative pulse voltage is 60V, the frequency is 600Hz, the positive pulse duty cycle is 20%, the negative pulse duty cycle is 10%, and the number ratio of positive and negative pulses is 4:1.

[0055] BaTiO prepared in this example 3 / TiO 2 The surface roughness of the coating is 1.45 μm (the surface roughness of the coating obtained in Example 1 is 2.19 μm). Compared with Example 1, the micro-arc discharge intensity is obviously weakened, the roughness is reduced, the hardness is improved, and the internal defects of ...

Embodiment 3

[0057] This example provides a method for preparing BaTiO on the surface of a titanium substrate 3 / TiO 2 The method of piezoelectric antibacterial coating, the steps are basically the same as in Example 1, the only difference is: in this example, in order to obtain a micro-arc oxidation coating of considerable thickness in step (3), the operation mode is constant current mode. That is, the current is 0.25A, the frequency is 800Hz, and the pulse duty ratio is 30% under the operating parameters of the micro-arc oxidation treatment for 10min.

[0058] BaTiO prepared in this example 3 / TiO 2 The thickness of the coating is 18 μm (the thickness of the coating obtained in Example 1 is 12 μm). Compared with Example 1, although the thickness of the micro-arc oxidation film increases, the oxidation resistance increases, but the oxidation current is constant, so that the micro-arc oxidation resistance is increased. The growth of the oxide film layer did not weaken in the later stage...

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Abstract

The invention provides a method for preparing BaTiO on titanium surface 3 / TiO 2 The method for piezoelectric antibacterial coating includes: A. Pretreatment of a titanium substrate; B. Immersion of the pretreated titanium substrate into an electrolyte, and performing micro-arc oxidation treatment to obtain BaTiO 3 / TiO 2 Piezoelectric antibacterial coating; in step B, the electrolyte includes the following components: 0.007-0.028mol / L sodium silicate nonahydrate, 0.008-0.033mol / L sodium hexametaphosphate, 0.002-0.035 mol / L barium titanate powder. In the present invention, BaTiO is prepared in situ on the surface of the titanium substrate by using the micro-arc oxidation technology. 3 Doped TiO 2 Modified titanium coating to obtain BaTiO with piezoelectric response 3 / TiO 2 The composite ceramic coating has both antibacterial properties and corrosion resistance and wear resistance, and can be used as an antibacterial protective layer on the surface of facilities that have long-term service underwater.

Description

technical field [0001] The invention relates to the technical field of metal surface coatings, in particular to a preparation of BaTiO on titanium surface 3 / TiO 2 Methods for Piezoelectric Antimicrobial Coatings. Background technique [0002] Titanium and its alloys have been widely used in the aviation industry, marine ships, medical and surgical instruments and other materials due to their low density, non-magnetic properties, high specific strength, good biocompatibility, non-toxicity, corrosion resistance and other excellent properties. Especially when used as a marine service facility, the chloride ion (Cl - ) corrosion has better resistance. Although titanium metal is widely used in various fields due to its excellent comprehensive properties, there are still some problems in practical applications with the expansion of its application range. First of all, titanium-based metal has poor wear resistance, which affects the safety and durability of its use process. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26C25D15/00
CPCC25D11/26C25D11/026C25D11/024C25D15/00
Inventor 刘磊王若云周潼刘洁杨剑飞胡文斌
Owner SHANGHAI JIAO TONG UNIV
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